Art of forming, attaching, and positioning nick-pins in type-molds.



J. S. BANCROFT & AQL. KNIGHT. ART OF FORMING, ATTAGHING, AND POSITIONINGNICK PINS IN TYPE MOI-BS.

APPLICATION FILEI) JUNE 7, 1909.

Patented Mar. 22, 1910.

UNI STATES PATENT @FFIQE.

JOHN SELLERS BANCROFT AND AMOS L. KNIGHT, F PHILADELPHIA, PENNSYLVANIA,

ASSIGNORS T0 LANSTON MONOTYPE MACHINE COMPANY, OF PHILADELPHIA,

PENNSYLVANIA, A CORPORATION OF VIRGINIA.

ART OF FORMING, ATTACHING, AND POSITIONING NICK-PINS IN TYPE-MOLDS.

To all whom it may concern:

Be it known that we, JOHN SELLERS BAN- cnor'r and Amos L. KNIGHT, ofPhiladelphia, in the county of Philadelphia, State of Pennsylvania, haveinvented a certain new and useful Improvement in the Art of Forming,Attaching, and Positioning Nick- Pins in Type-Molds; and we do herebydeclare the following to be a full, clear, and

exact description of the same, reference being had to the accompanyingdrawings, forming a part of this specification, and to the figures ofreference marked thereon.

As is well known, an exceptionally high degree of accuracy is requiredin the C011 struction of type molds, more especially such as areprovided with adjustable or movable members for varying the dimensionsof the mold cavity, opening the latter and ejecting the type, whereinthe maintenance of form is complicated by the necessity for metal tightjoints. One of the most difficult of the many problems presented is thelocating of the nick pin or protuberance for forming the nick ortransverse groove in one side of the type. The mold blade or equivalentmember coacting with the mold block or member to which the nick pin issecured, is grooved on one side to receive and fit this protuber- 30ance and at the same time rides upon the floor of the mold bladechannel, hence to maintain a metal tight joint all around the mold bladeat the casting face of the latter, the nick pin or protuberance on themold block together with the groove in the mold blade must be accuratelypositioned relative to the floor of the mold blade channel, in order toavoid the binding of the parts or open joints. The problem is furthercomplicated by the circumstance that, for practical reasons, the blockor member carrying the nick pin or protuberance is required to have fouror more of its surfaces dressed in planes intersecting at predeterminedangles, usually 90. Take, for example, Patent No. 752,814 of February23, 1904:, which illustrates a commercial form of type mold. The sideblock carrying the nick pin has its front and rear surfaces dressed inparallel planes perpendicular to the base or under surface, the inner ornick pin surface in a plane perpendicular to the base and intersectingthe Specification of Letters Patent.

Application filed June 7,

Patented Mar. 22, 1910.

1909. Serial No. 500,553.

front and rear surfaces at right angles thereto, and the top of thematrix seat in parallel with the base. The tolerance, 2'. 6.,permissible degree of variance from stand ard measurement, is soexceedingly small that it is found commercially impractical. to make theprotuberant section integral with the mold block, hence it is customaryto make it in the form of an insert and to apply it after the faces ofthe block have been dressed or lapped to the required dimensions. Themore common practice is to form an undercut groove in one face extendinga short distance from one edge and as near as may be parallel with thebase at a predetermined distance therefrom. This is usually done bydrilling a small hole near the edge and intersecting the mold bladeface. This, in itself a somewhat difficult and delicate operation, isrequired to be performed prior to the hardening and finishing of theblock, in consequence of which it not infrequently happens that when thesurfaces of the block have been trued up the nick pin recess is found tobe either too near or too remote from the base, so that an aftertreatment of the inserted nick pin is required to bring it into accurateregistry with the groove in the mold blade when the latter is seated inits channel, or, in the alternative, the mold blade must be 'rooved tocorrespond with the distorted position of the nick pin.

As the nick pin is the variable factor the most approved practice is todress the nick pin to standard position and proportions, in accordancewith the interchangeable plan of manufacture. This adds materially tothe cost of construction as the operation is a delicate one requiringthe exercise of a high order of skill and considerable time. Difficultyhas also been experienced in securing the nick pin in its seat againstlongitudinal displacement. The pin is short, (from g to 5), small indiameter, (approximately .081) and of a material. usually steel, adaptedto stand up against the friction of the mold blade and the action of themolten metal injected under considerable pressure into the mold.

Now the primary object of the present invention is to provide aneffective, certain and cheap method and means for accurately positioningand securely fastening the nick pin to the mold block, whereby theinaccuracies in the location of the nick pin recess due to the finishingof the mold block are automatically compensated for and the subsequentdressing of the protuberant section rendered ui'mecessary, and, at thesame time, the nick pin is securely anchored in its seat in the moldblock.

To these ends the present invention consists, broadly, in subjecting anick pin blank to a deforming pressure within a sectional cavity formedby the-junction of the undercut nick pin recess of the mold block and anassociated die, the latter containing a groove or seat corresponding tothe terior or n'otuberant section of the finished nick pin and locatedin a fixed and predetermined position relative to the base or otherdatum line on the mold block and corresponding with the nick pinposition on a standard mold block, the pressure thus applied beingsutlicient to cause the exterior of the blank to conform to the interiorwalls of the cavity in which it is confined, whereby the nick pin isformed in site with the protuberant section in predetermined relation tothe base of the mold block.

The invention further consists in the employment of a tubular or hollowblank and deforming the latter by the application of pressure to theinterior thereof, causing the material to expand and fill the confiningchamber or cavity; in anchoring the nick pin in its seat or recess bycansii'ig the same to interlock with a shoulder in or on the wall of itsseat; and in the produced article, all as hereinafter fully described,the novel f atures being pointed out in the claims.

In the accon'ipanying drawings illustrating a preferred means forcarrying the improved method or process into practice-- Figure 1 is alongitudinal section through the sub-press equipped with the mold blockholding and nick pin blank deforming appliances, the nick pin blank andthe recess in the type block being enlarged disproportionally. Fig. 2 isa perspective view of the nick pin forming die and means for adjustingand holding the mold block, the nick pin blank being in position toreceive the deforming pressure. Fig. 3 is a sectional view of a portionof the sub-press showing the nick-pin after being subjected to pressure.Fig. lis a diagrammatic top plan view illustrating on an enlarged scalethe nick pin forming die adjusted to a mold block with a displaced nickpin recess and a tubular nick pin blank in position for the deformingoperation. Fig. 5 is a similar view showing the effects of deformation.Fig. 6 is an enlarged sectional view of the nick pin and a portion ofthe mold block showing the interlocking effect by deformation of thenick pin blank.

Like numerals designate the same parts in the several figures.

lt is of the first importance that the die for giving shape to theprotuberai'it section of the nick pin should be tirmly clamped to themold block and accurately positioned relative to the base or otherestablished datum line on said block. To insure this a die block lprovided with a flat face 2 and transverse groove 3,the lattercorresponding with the protruding section of the nick pin and thecomplemental groove in the mold blade, is secured within an opening orrecess in a block or holder with its face 2 perpendicular to the face ofa hardened steel plate 5, the latter also secured to block a. Groove 23being accurately positioned with relation to plate 5, the latter servesas a datum line or gage for locating the protruding section of the nickpin when the mold block 3 is inserted and clamped with its base uponplate 5 and its nick pin face against the face of block 1. Suitablemeans, such as wedges orscrews, are employed for securely and firmlyclamping the mold block into the angle between the die block 1 and plate5. If the undercut nick pin recess 7 in mold block (3 happens to beproperly located with relation to the base or datum line of the latterits edges will register with corresponding edges of groove 3. If,however, as is frequently the case. recess 7 happens to lie slightly toone side of the standard position, due to the dressing performed uponits base or the inaccurate forming of said recess, or in the event itisdesired to increase or diminish the lateral dimensions of theprotuberant section of the nick pin relative to the width of recess 7,the edges of the roove and recess will be more or less out of register.A displacement such as above referred to is illustrated in Figs. 1 andHaving secured the mold block and die block in the described relativepositions a nick pin blank t) is inserted within the cavity formed bythe junction of recess T and groove 3, and suilicicnt pressure isapplied to said blank to cause it to expand into contact with the wallsof said cavity, as indicated in Fig. 5, the portion conforming to andcontained. within undercut recess 7 serving as the means of attachmentto the mold block, while the protuberant section not only takes the formof groove but is at the same time accurately positioned upon the moldblock with relation to its base or other datum line.

In the example illustrated the hardened steel plate 5 is held toposition by one or more bolts 16 extending through the wall of block tand threaded into said plate, and die block 1 is in like manner providedwith a similar bolt 17. The mold block 6 is held firmly in contact withthe face of plate 5 by means of bolts 18 threaded into block a withtheir inner ends engaging a shoe 19, the lat ter interposed between saidscrews and block 6. A wedge (not shown) or equivalent means inserted inthe space 20 between blocks s and the end of block 6 serves to hold thegrooved face of said mold block in contact with the face of die block 1while pressure is being applied to the blank 9.

The deformation of the blank is preferably performed by cold pressureand to facilitate this the blank is made tubular or hollow and thedeforming pressure applied to its interior. The lower or inner end ofthe blank engaging the end wall of recess 7 is closed, as by theinsertion of a plug 10 of soft metal such as copper, and to facilitatethe insertion and engagement of said plug the upper section of the blankis formed with a slightly enlarged bore, so that not withstanding thesmall dimensions of the blank (less than .081 diameter) the plug canreadily be entered therein and when entered will drop by gravity or maybe forced into the smaller bore at the inner end. In Fig 1 the plug 10is illustrated as engaging the inner end of the smaller bore, into wlnchit is first forced and then expanded by the pressure transmitted throughthe liquid above said plug, this method of inserting the plug beingpreferred as tending to prevent accidental escape and to secure accuratefit ting of the plug within the smaller bore, other wise the plug mightbe fully entered within said smaller bore before pressure is applied.The upper end of the blank projects beyond the mold block and die plateand is fitted to the open end of a cylinder 11 charged with a fluid, oilfor example, and equipped with a piston 12. The piston and cylinder aresupported in a head 13, the latter resting loosely upon block 4 andprovided with dowel pins or equivalent means for alining cylinder 11 andblank 9. The parts being adjusted to position pressure is appliedthrough piston 12 to the liquid within the blank as well as to the softmetal plug in the end thereof upsetting the latter and causing the blankto expand radially in all directions until its exterior surface conformsaccurately to the inclosing walls. The application of pressure to piston12 may be performed by a weight of approximately seventy pounds fallingthrough a distance of about twelve inches and the drop may be repeatedif required, although in practice a single drop of the weight is usuallysuflicient. Other known means, such as an accumulator or hydraulic pressmay be employed to produce the required pressure within the blank, butthat described has proved effective in practice.

To prevent the accidental displacement of the nick pin under normalconditions of use, the wall of recess 7 is furnished with one or morelateral depressions or projections, illustrated by the depression 15,Fig. 6, into which the material of the nick pin blank is driven by thedeforming pressure applied within the latter.

After the nick pin has been thus formed, seated and located all that isrequired to finish the mold block is to dress oil the projecting endflush with the face of the mold block.

The new and improved product of the method described is not hereinclaimed. but is reserved for a divisional application.

Having thus described our invention, whatwe claim as new, and desire tosecure by Letters Patent of the United States, is

1. The improvei'nent in the art of fitting nick pins in type mold blockswhich consists in subjecting a blank to a deforming pressure within aconfining cavity or chamber at the junction of the mold block and anassociated forming and positioning die block.

2. The improvement in the art of fitting nick pins to type mold blockswhich consists in subjecting a blank to deforming pressure within acavity or chamber at the junction of the mold block and a die, thesection of said cavity or chamber contained in the mold block beingundercut and the section in the die conforming to the protuberant faceof the nick pin being accurately positioned relative to a fixed datumline on the mold block, whereby the protuberant section is accuratelypositioned and at the same time secured to the mold block.

3. The improvement in the art of fitting nick pins in type mold blockswhich consists in inserting a tubular blank within a recess or chamberformed at the unction of the face of the mold block and a detachabledie, the section of said recess contained in the mold block beingundercut and that in the die located in predetermined relation to thebase or datum line of the mold block, and applying pressure within theblank suflicientin degree to expand the same into contact with the wallsof the containing cavity or recess.

at. The improvement in the art of fitting and securing nick pins inundercut grooves in type molds which consists in providing said groovewith a lateral recess or shoulder; clamping to the grooved face of themold block a die containing a groove corresponding to the protuberantsection of the nick pin and accurately located with relation to the baseof or a datum line on the mold block, said die groove communicating withthe groove in the mold block; inserting a blank within the chamberbetween the mold block and die; and subjecting said blank to a deformingpressure, sufficient in degree to cause the material to expand andcontact with the surrounding walls of the chamber.

The improvement in the art of :torming and fitting nick pins for typemold blocks provided with undercut grooves or recesses which consists inapplying to the grooved face of the mold block a die containing a grooveor recess communicating with that in the mold block and conforming inshape and position to the protuberant section of the nick pin, andapplying deforming pressure to the interior of a tubular blank withinsaid grooves 01' recesses, whereby the blank is caused to fill therecess or groove within the mold block and be anchored therein while theportion of the blank outside the mold block is both shaped andaccurately located to conform to the form and assigned position of theprotuberant section oi. the nick pin.

6. The improvementin the art of forming and positioning nick pins fortype molds which consists in subjecting a tubular blank to deformingpressure applied to the inteesasee rior of said blank while locatedwithin a confining chamber composed in part by the undercut Walls of agroove or recess in the face of the mold block and in part by acommunicating groove or recess in a die block applied to the face of themold block, said die groove corresponding to the exposed surface of theprotuberant section of the nick pin and being accurately locatedrelative to a datum line on the mold block.

7. The improvement in the art of forming attaching and positioning nickpins for type molds which consists in inserting a soft metal plug in oneend of a tubular blank, confining said blank in a cavity formed partlyin a die block and the balance in the mold block, and simultaneouslyexpanding the tubular blank and upsetting the inserted plug by fluidpressure applied to the interior of said blank.

JOHN SELLERS BANCROFT. Ah/IOS L. KNIGHT. \Vitnesses MORTIMER A. J owns,Josnri-i B. CHURCH.

